Voice mail messages need to be deleted

I am having 100 voice mails in my cisco unity voice mail box and I would like to delete last 50 messages from my mailbox. Anyway I dont want to delete the messages from my phone because I know it would take lot of time to do it. Hence, I would like to delete systematically.. Is there any option to delete the voice mails in cisco unity? As far as i know if I apply the aging policy in cisco unity it is affecting all the customers.. I dont want IMAP configuration as well for delete the voice mail messages from my mail box. Any help would be greatly appreciable!!!!

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